toms hardwareGeekbench5M1 Ultra64Threadripper 3990X4% x86M1 Ultrai9-12900KAMD9 5950X M1 Ultra20 CPU60 280W TDPThreadripper 3990XM1 Ultra4.7 M1 Ultra20CPU164 GPU486432128GB800GB/s M1 Ultra1140M1â